Method of producing an electroluminescence phosphor

Abstract

A method of producing an electroluminescence phosphor, which contains the steps of: mixing a phosphor matrix, a flux, an activator, and a particle diameter-controlling additive that does not enter into a crystal lattice of the phosphor matrix, to give a mixture; and baking the mixture, to produce the electroluminescence phosphor, the method containing the step of: adding an acidic or alkaline solution, to remove the particle diameter-controlling additive from the phosphor; an electroluminescence phosphor, which is produced by the method; and an electroluminescence device, which contains the electroluminescence phosphor.

1 . A method of producing an electroluminescence phosphor, comprising the steps of:
 mixing, in a solid state, a phosphor matrix, a flux, an activator, and a particle diameter-controlling additive that does not enter into a crystal lattice of said phosphor matrix, to give a mixture; and   baking the mixture, to produce the electroluminescence phosphor, said method further comprising adding an acidic or alkaline solution, to remove the particle diameter-controlling additive from said phosphor.   
   
   
       2 . The method of producing an electroluminescence phosphor according to  claim 1 , wherein a residual rate of the particle diameter-controlling additive is 5% or less. 
   
   
       3 . The method of producing an electroluminescence phosphor according to  claim 1 , wherein the particle diameter-controlling additive has a particle diameter of 0.005 to 0.5 μm. 
   
   
       4 . The method of producing an electroluminescence phosphor according to  claim 1 , wherein the particle diameter-controlling additive has a particle diameter of 0.01 to 0.2 μm. 
   
   
       5 . The method of producing an electroluminescence phosphor according to  claim 1 , wherein the particle diameter-controlling additive is a compound containing at least one selected from the group consisting of alkali metal oxides, alkali earth metal oxides, and transition metal oxides. 
   
   
       6 . The method of producing an electroluminescence phosphor according to  claim 1 , wherein the particle diameter-controlling additive is a compound containing an alkali earth metal oxide. 
   
   
       7 . The method of producing an electroluminescence phosphor according to  claim 1 , wherein the particle diameter-controlling additive is selected from magnesium oxide, calcium oxide, and zinc oxide. 
   
   
       8 . The method of producing an electroluminescence phosphor according to  claim 1 , wherein the particle diameter-controlling additive is magnesium oxide. 
   
   
       9 . The method of producing an electroluminescence phosphor according to  claim 1 , wherein the baking is carried out at a temperature ranging from 900 to 1300° C. 
   
   
       10 . The method of producing an electroluminescence phosphor according to  claim 1 , wherein the baking is carried out at a temperature ranging from 1200 to 1300° C. 
   
   
       11 . The method of producing an electroluminescence phosphor according to  claim 1 , wherein the baking is carried out for 30 minutes to 10 hours. 
   
   
       12 . The method of producing an electroluminescence phosphor according to  claim 1 , further comprising the step of baking the phosphor removed with particle diameter-controlling additive at 500 to 800° C. 
   
   
       13 . The method of producing an electroluminescence phosphor according to  claim 1 , wherein the particle diameter-controlling additive is added in a ratio of 2 to 80 mass % to the phosphor matrix. 
   
   
       14 . The method of producing an electroluminescence phosphor according to  claim 1 , wherein the phosphor matrix has zinc sulfide. 
   
   
       15 . The method of producing an electroluminescence phosphor according to  claim 1 , wherein the phosphor obtained has an average circle equivalent diameter of less than 20 μm.